US 11,852,518 B2
Resistive wire wiring shield to prevent electromagnetic interference
Andrew F. Douglass, Bellevue, WA (US); and Andrew M. Robb, Seattle, WA (US)
Assigned to The Boeing Company, Chicago, IL (US)
Filed by The Boeing Company, Chicago, IL (US)
Filed on Feb. 14, 2022, as Appl. No. 17/670,853.
Claims priority of provisional application 63/190,722, filed on May 19, 2021.
Prior Publication US 2022/0373380 A1, Nov. 24, 2022
Int. Cl. G01F 23/22 (2006.01); G01F 23/263 (2022.01); B64D 45/02 (2006.01)
CPC G01F 23/263 (2013.01) [B64D 45/02 (2013.01); G01F 23/22 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A system, comprising:
a fuel level sensing probe inside a fuel tank;
an exciter wire bundle configured to electrically connect the fuel level sensing probe to an electric power source outside the fuel tank, wherein the exciter wire bundle comprises a plurality of excitation wires and a grounded guard wire, and wherein each excitation wire of the exciter wire bundle and the grounded guard wire of the exciter wire bundle comprise a resistive non-metallic wire;
a return signal wire bundle configured to electrically connect the fuel level sensing probe to a device configured to measure a quantity of fuel within the fuel tank by using a return signal from the fuel level sensing probe, wherein the return signal wire bundle comprises a plurality of return signal wires and a grounded guard wire, wherein the grounded guard wire of the return signal wire bundle and the grounded guard wire of the exciter wire bundle are configured to shield each return signal wire of the return signal wire bundle from electromagnetic interference, and wherein each return signal wire of the return signal wire bundle and the grounded guard wire of the return signal wire bundle comprise a resistive non-metallic wire;
a first sealed connector extending through a wall of the fuel tank, the first sealed connector being configured to electrically connect the plurality of excitation wires to the electrical power source; and
a second sealed connector extending through the wall of the fuel tank, the second sealed connector being configured to electrically connect the plurality of return signal wires to the device.